Pseudomyrmex nigropilosus (Emery 1890)

Ward, Philip S., 1993, Systematic studies on Pseudomyrmex acacia-ants (Hymenoptera: Formicidae: Pseudomyrmecinae), Journal of Hymenoptera Research 2, pp. 117-168: 159

publication ID

http://doi.org/ 10.5281/zenodo.10150

publication LSID

lsid:zoobank.org:pub:80669360-1DB2-4B74-9F4B-99DD3E7EBBFA

DOI

http://doi.org/10.5281/zenodo.3513448

persistent identifier

http://treatment.plazi.org/id/F1D1ADD1-87DA-5B2B-41D5-249F7989635F

treatment provided by

Donat

scientific name

Pseudomyrmex nigropilosus (Emery 1890)
status

 

Pseudomyrmex nigropilosus (Emery 1890) 

(Fig. 7)

Pseudomyrma nigropilosa Emery  1890:62. Syntype workers, Liberia , Costa Rica (A. Alfaro) ( MCSN,  MHNG) [Examined]  ,

Pseudomyrmex nigropilosus (Emery)  ; Kempf 1958:453.

Worker diagnosis. With the traits of the P. gracilis  group (see couplet 6 of key) and the following more specific features. Head longer than broad (Cl 0.84-0.90); anterior margin of median clypeal lobe convex, conspicuously protruding; dorsolateral margination of pronotum usually blunt; mesonotum more steeply inclined than basal face of propodeum; petiole relatively robust ( PLI 0.69- 0.77) with a short anterior peduncle (Fig. 7, 53); head and mesosoma densely punctulate to coriarious-imbricate, and subopaque; standing pilosity conspicuous on most of the body including the outer faces of the tibiae, consisting largely of black hairs, those on the petiole and propodeum long (> 0.20 mm) and curved. Color varying from concolorous orange-brown to bicolored orange and black to (western Mexico) predominantly black with orange mottling on the head, mesosoma, and appendages.

Taxonomic comments. - Among the Pseudomyrmex  species recorded from swollen-thom acacias, P. nigropilosus  is easily identified by its elongate eyes and head ( REL 0.55-0.59, Cl 0.84- 0.90), short petiole ( PLI 0.69-0.77), and conspicuous black pilosity (Fig. 7). Kempf (1958) provides further descriptive details.

Distribution and biology. - P. nigropilosus  is found from Nayarit, western Mexico to Guanacaste Province, Costa Rica, and is restricted to nesting in swollen-thom acacias (including Acacia collinsii View Cited Treatment   , A. cornigera View Cited Treatment   and A. hindsii View Cited Treatment   ). It is a member of the P. gracilis  group and therefore not closely related to the principal group of acacia-ants ( P. ferrugineus  group). Janzen (1975) points out that P. nigropilosus  is essentially a parasite of the Pseudomyrmex  / Acacia  mutualism. It occupies abandoned or otherwise uninhabited plants and reaps the benefits of this association without protecting the acacia from herbivores or competing plants. Additional information about the ecology of this species is given in Janzen (1975).

MCSN

Italy, Genova, Museo Civico di Storia Naturale "Giacomo Doria"

MHNG

Switzerland, Geneva, Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Pseudomyrmex

Loc

Pseudomyrmex nigropilosus (Emery 1890)

Ward, Philip S. 1993
1993
Loc

Pseudomyrma nigropilosa

Emery 1890
1890